Quantum Field Theory
Quantum Field Theory (QFT) is a theory of quantum force that describes the underlying force action as that of a "quantum field" in spacetime. The "field" in question is an only mathematical construct so that the time can play as a matrix like the spatial operator in quantum mechanics can. Although quantum field theory is local by field concept, quantum mechanics is non-local by action at a distance of Bell inequalities. Therefore quantum mechanics, or at least by fields, is in an inconsistent state of physics, even though mathematically it is apparently consistent. However, even mathematically it is "plagued" by infinities of perturbative approach by Feynman diagrams of QCD and gravity interactions. Theory of QED is also infinite plagued, but there exists a "method" of, essentially, ignoring the infinities when they make the answer wrong in order to derive the "correct" answer.